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Low-voltage high resistance grounding

Eaton’s high resistance grounding system limits the magnitude of current during a ground fault, reducing arc flash energy to increase personnel safety and minimize the failure of motors, transformers, power cables and other equipment. Providing integrated fault tracing for easy detection, the solution is ideal for critical applications such as industrial, oil and gas, petrochemical, healthcare and utility.

Low-voltage high resistance grounding
Up to 600 V
1 – 10 Amps,
1 A increments
Up to 200 kAIC

Core features

  • Provides ground fault detection and integrated fault tracing for quick resolution
  • Enhances personnel safety by reducing the risk of arc flash
  • Built-in alarm alerts operator of problem
  • Available with a Wye connection with neutral option or Delta connection with artificial neutral option
  • Stand alone in NEMA 1 or NEMA 3R enclosure (Eaton HRG), custom ratings and options available
  • Ground fault limiting up to 5 A with Eaton HRG, custom up to 10 A available
  • Optional integration of Eaton HRG within Eaton’s Magnum DS™ low-voltage switchgear, low-voltage motor control centers (MCC) and switchboards

Eaton HRG (standalone or integrated)

Eaton HRG is available in a standalone NEMA 1 or NEMA 3R enclosure. As an option, the system can be integrated within Eaton’s Magnum DS™ low-voltage switchgear, low-voltage motor control centers (MCC) and switchboards.

High resistance grounding

Low-voltage high resistance grounding systems

Grounding is commonly used in the electrical industry to mean an intentional connection to earth of conductive materials either solidly or through impedance. An ungrounded system is a system, circuit, or apparatus in which there is no intentional connection between the system conductors and earth.  A system may still be considered ungrounded if there is a possible connection to earth ground through potential measuring devices or very high impedance devices. High resistance grounding, mainly used in low-voltage systems, most common in 480 V and 600 V systems, this arrangement means that a certain resistance has been intentionally put between the neutral point of a system and earth ground.

Factors to consider when choosing a grounding system:

  • There is a need for service continuity after the first ground fault
  • There is a need to be able to easily locate ground faults
  • There is no need to serve line-to-neutral loads
  • If there is no available neutral, it will be necessary to create an artificial neutral
  • It will be necessary to estimate, calculate, or measure the capacitive charging current of the system
  • The magnitude of maximum current acceptable on the system under ground-fault conditions

Eaton’s Electrical Engineering Services and Systems

With more than 1,500 experts in 60 locations throughout Canada and the U.S., and more around the world, Eaton’s Electrical Engineering Services and Systems team is one of the largest and most experienced service organizations in the industry.